156122381 has 2 divisors, whose sum is σ = 156122382. Its totient is φ = 156122380.

The previous prime is 156122359. The next prime is 156122387. The reversal of 156122381 is 183221651.

156122381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 110775625 + 45346756 = 10525^2 + 6734^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-156122381 is a prime.

It is a super-2 number, since 2×156122381² = 48748395698218322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (156122387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78061190 + 78061191.

It is an arithmetic number, because the mean of its divisors is an integer number (78061191).

Almost surely, 2^156122381 is an apocalyptic number.

It is an amenable number.

156122381 is a deficient number, since it is larger than the sum of its proper divisors (1).

156122381 is an equidigital number, since it uses as much as digits as its factorization.

156122381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 29.

The square root of 156122381 is about 12494.8941972311. The cubic root of 156122381 is about 538.4619942733.

The spelling of 156122381 in words is "one hundred fifty-six million, one hundred twenty-two thousand, three hundred eighty-one".